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Neutron scattering experiments have been performed on single crystals of NpAs and NpSb. The critical exponents and a detailed investigation of the complex magnetic phase diagram of NpAs as a function of temperature are presented. The anisotropy ratios in the critical scattering are 2.9(5) and 4.5(10) in NpAs and NpSb, respectively. The incommensurate-to-commensurate transition in NpAs was studied and found to be consistent with the McMillan approach, based on a Landau expansion. The 4+, 4- magnetic structure that exists over a narrow temperature range in NpAs is almost a complete square-wave modulation. These results, taken together with those for the isostructural uranium monopnictides, indicate the importance of invoking anisotropic interactions. The experiments provide strong motivation for extending the theories to Np, the element following uranium, and in the trivalent state having the configuration 5f(4).

Additional information

Authors: JONES D L, Keele University, Department of Physics, Keele (GB);STIRLING W G, Keele University, Department of Physics, Keele (GB);LANDER G H, JRC Karlsruhe (DE);REBIZANT J, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);ALBA M, Institut Laue-Langevin, Grenoble (FR);VOGT O, ETH, Zürich (CH)
Bibliographic Reference: Article: Journal of Physics: Condensed Matter, Vol. 3 (1991) pp. 3551-3562
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